Bunn FMDA DBC-3 User Guide

SERVICE (cont.)

Test Procedure:
1. Disconnect the dispenser from the power source.
2. Disconnect the black or white/brown wires from

the main harness.

3. With the switch in the “ON” (lower) position check

for continuity between the center and the upper
terminal. With the switch in the “OFF” (upper)
position no continuity should be present between
center and upper terminals.

If continuity is present as described, the heater “ON/
OFF” switch is operating properly.
If continuity is not present as described, replace the
switch.

Removal and Replacement:
1. Refer to the hopper section in this manual and

remove the hopper assemblies and the hopper
support plate.

2. Remove the switch mounting nut on the front of

the front panel.

3. Remove switch with wires attached from the rear

of the front panel.

4. Remove the wires from the switch terminals and

discard switch.

5. Connect the wires to the new switch, refer to fig.

40.

5. Push new switch through hole in the front panel

and secure with face nut.

7. Refer to the hopper section in this manual and

install the hopper support plate and the hopper
assemblies.

FIG. 40 TANK HEATER SWITCH TERMINALS

P1219

TANK HEATER SWITCH (cont.)

BLK from Main Harness
(Mechanical Thermostat)
WHI/BRN from Main Harness
(Electronic Thermostat)

TRANSFORMER

FIG. 41 TRANSFORMER

P1646

Location:

The transformer is located behind the lower

front access cover, mounted on the right rear side
of the component bracket.

Test Procedure:
1. Disconnect the dispenser from the power source.
2. Disconnect the four pin plug from the main har-

ness from the four pin connector on the trans-
former.

Check the voltage across black wire (pin 1) and the
white wire (pin 2) on the plug from the main
harness. Connect the dispenser to power source.
The indication must be:
a) 120 volts ac for two wire 120 volt models.
b) 120 volts for three wire 120/208 and 120/240
volt models.
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.

4. Disconnect the dispenser from the power source.

If voltage is present as described reconnect the plug
and the connector and proceed to #5.
If voltage is not present as described, refer to the
wiring diagrams and check the main wiring harness.

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